Tab-plate for saws



(No Model.)

J. E. EMERSON.

I TAB PLATE FOR SAWS. No. 297,242. Patented Apr. 22,1884.

u $253375.- r ,ZZv/azztww Uterine STATES PATENT @rrrcs.

JAMES E. EMERSON, OF BEAVER FALLS, PENNSYLVANIA.

TAB-PLATE oe SAWS.

SPECIFICATION forming part of Letters Patent No. 297,22, dated April 22,1884:.

I Application filed March 10, 1884. (No model.)

.To all whom it may concern:

Be it known that I, J AMES E. EMERSON, a citizen of the United States,residing in Beaver Falls, in the county of Beaver and State ofPennsylvania, have invented certain new and useful Improvements inTab-Plates for Saws, of which the following is a specification,reference being had therein to the accompanying drawings.

This invention relates to the construction of the metal plates known astabs, that are to be attached to saws that are strained in reciprocatingsashes or frames, and more especially What are termed gangsaws, and itconsists in the construction of the plates that form the tabs, as anarticle of manufacture, as will be fully hereinafter described.

In the drawings, Figure 1 represents in perspective an unfinishedtab-plate, showing the side of the plate that is next the saw-plate whenattached thereto and one bolt-hole therein. finished. Fig. 2 representsin perspective the opposite or outside of the plate when finished. Fig.3 represents an edge view of a plate partly in section, but broken atits ends; and Fig. 4 represents an end View of a finished plate.

These tabplates are constructed from strips of steel of the properthickness, and cut to the proper length, then heated to a cherry-redheat, and when in such heated condition the blanks are placed overproper forming-dies,

with a gang of punches over the dies, that are to be forced down uponthe heated plate, when the plate will be perforated with the necessarynumber of holes, countersinks, and projecting flanges around the holesand beveled edge, as seen in Figs. 1 and 2, by a series of drop or presspunches, or a'single punch can be'nsed with proper gages, to give theright distance to the holes from the edges and ends of the plate, andalso between the holes in the plates themselves; but I prefer to use agang of punches with corresponding dies, so that by a singlereciprocation of the press or drop theforging the plate into form iscompleted. The

plate as it comes from the drop or press is shown at Fig. 1, with theexception that the burr, or that part of the metal punched out, is

removed from the left-hand hole, so as to show the projecting ring orflange around the hole,

while in Fig. 2 the opposite side of a plate is shown with its rivet orscrew holes through the plate, to receive either a rivet or screwbolt orheaded nut, and a countersink to re ceive the thickness of the head ofsuch rivet or screw'bolt, or to receive the upset of arivet, or a headednut, into which the screw-bolt is to be screwed.

A represents the tab-plate, of steel of proper length and width, andhaving one edge, a, beveled its entire length, and as many holes Bpunched through it as the width of the saw-. blade to which the platesare to be attached may require.

B represents the burr, or that portion of metal forward of the punch tobe removed entirely from the plate.

I) I) represent countersinks around the holes B, and indented into thetab-plate deep enough to receive the thickness of the head or upset of arivet or head of a screw-bolt without projecting beyond the outside faceof the plate.

I) I) represent inwardly-projecting flanges 0r rings around the holes B.

These plates are to be constructed in pairs, or so that when the inside,or that side that the flanges or rings 1) project from, shall comeagainst the saw-plate, the holes B will be coincident with each otherand with holes in the saw-blade to which the plates are to be attached.

The method and use of so attaching the tab-plates to saws constructed asabove de- M...

scribed are fully shown in another application filed simultaneouslyherewith, and in which the use of tab-plates so constructed is claimedin connection with the saw to which they are attached. After the platesA are taken from the drop or press, the burrs B are removed from theflanges or rings 12, and the surplus metal or fin a is removed from theextreme edge of the bevel a. The plate can then be passed through afinishing process that will leave them all of the same width, and thebeveled edges straight, of the same bevel, and exact-1y true, when theflanges b can be temb, and beveled edge a, substantially as de 10 pered,if necessary, and the platestare comscribed.

plete. In testimony whereof I affix my signature in Having thusdescribed myinvention, what I presence of two witnesses.

5 claim, and desire to secure by Letters Patent,

JAMES E. EMERSON.

The tab-plates A, as an article of 'manufaci \Vitnesses: ture, havingrivet or screw holes B, counter- NEWTON CRAWFORD,

sinks b, inwardly-pr0jecting flanges 0r rings M. P. CALLAN.

